Laser frequency stabilization by bichromatic saturation absorption spectroscopy

Genov, Genko T.; Lellinger, Tim; Halfmann, Thomas; Peters, Thorsten

doi:10.1364/josab.34.002018

Cited by 12 publications

(5 citation statements)

References 26 publications

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“…With a trapping power of 110 mW inside the HCPBGF, we obtain a trap depth of around 4 mK. The probe laser is locked with an offset of 76 MHz to the transition 5 2 S 1/2 , F = 1 ↔ 5 2 P 1/2 , F = 1 via bichromatic saturation absorption spectroscopy [43]. The control laser is phase-locked to the probe yielding a two-photon linewidth of ∼ 8 kHz [see coupling scheme in Fig.…”

Section: Methodsmentioning

confidence: 99%

Single-photon-level narrowband memory in a hollow-core photonic bandgap fiber

Peters¹,

Wang²,

Neumann³

et al. 2020

Opt. Express

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An experimental platform operating at the level of individual quanta and providing strong light-matter coupling is a key requirement for quantum information processing. In our work, we show that hollow-core photonic bandgap fibers filled with laser-cooled atoms might serve as such a platform, despite their typical complicated birefringence properties. To this end, we present a detailed theoretical and experimental study to identify a fiber with suitable properties to achieve operation at the single-photon level. In the fiber, we demonstrate the storage and on-demand retrieval as well as the creation of stationary light pulses, based on electromagnetically induced transparency, for weak coherent light pulses down to the single-photon level with an unconditional noise floor of 0.017(4) photons per pulse. These results clearly demonstrate the prospects of such a fiber-based platform for applications in quantum information networks.

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Section: Methodsmentioning

confidence: 99%

Single-photon-level narrowband memory in a hollow-core photonic bandgap fiber

Peters¹,

Wang²,

Neumann³

et al. 2020

Opt. Express

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“…The main difference in the single-photon-level regime is the increase in background due to fluorescence. A good understanding of the absorption spectra is important for determining the temperature, number density, population of occupied levels or the chemical composition of the medium [24,25], as well as standard applications of atomic vapours such as laser locking [26,27], compact magnetometry [2], and atomic quantum memories [4]. This setup is ideal for replacing the low intensity probe laser with an appropriate single photon source.…”

Section: Discussionmentioning

confidence: 99%

Single-photon-level sub-Doppler pump-probe spectroscopy of rubidium

Burdekin,

Grandi,

Newbold

et al. 2020

Preprint

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We propose and demonstrate pump-probe spectroscopy of rubidium absorption which reveals the sub-Doppler hyperfine structure of the 5 S 1/2 ↔ 5 P 3/2 (D2) transitions. The counter propagating pump and probe lasers are independently tunable in frequency, with the probe operating at the single-photon-level. The two-dimensional spectrum measured as the laser frequencies are scanned shows fluorescence, Doppler-broadened absorption dips and sub-Doppler features. The detuning between the pump and probe lasers allows compensation of the Doppler shift for all atomic velocities in the room temperature vapor, meaning we observe sub-Doppler features for all atoms in the beam. We detail a theoretical model of the system which incorporates fluorescence, saturation effects and optical pumping and compare this with the measured spectrum, finding a mean absolute percentage error of 4.17%. In the future this technique could assist in frequency stabilization of lasers, and the single-photon-level probe could be replaced by a single photon source.

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“…We implement the experiment with cold 87 Rb atoms, loaded from a magneto-optical trap (MOT) into a HCPCF (NKT Photonics HC-800-02), involving a far off-resonant optical trap (FORT) to guide the atoms inside the fiber and prevent collisions with the roomtemperature fiber wall [26]. The probe laser is locked with an offset of 76 MHz to the corresponding transition via bichromatic saturation absorption spectroscopy [32]. The control laser is phase-locked to the probe yielding a two-photon linewidth of ∼ 8 kHz [31].…”

Section: Methodsmentioning

confidence: 99%

Stopped and stationary light at the single-photon level inside a hollow-core fiber

Peters,

Wang,

Neumann

et al. 2019

Preprint

Self Cite

View full text Add to dashboard Cite

An experimental platform operating at the level of individual quanta and providing strong lightmatter coupling is a key requirement for quantum information processing. We report on narrowband light storage and retrieval as well as stationary light, based on electromagnetically induced transparency, for weak coherent light pulses down to the single-photon level with a signal-to-noise ratio of 59. The experiments were carried out with laser-cooled atoms loaded into a hollow-core photonic crystal fiber to provide strong light-matter coupling, thereby demonstrating the prospects for future quantum networks of such a platform.

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Laser frequency stabilization by bichromatic saturation absorption spectroscopy

Cited by 12 publications

References 26 publications

Single-photon-level narrowband memory in a hollow-core photonic bandgap fiber

Single-photon-level narrowband memory in a hollow-core photonic bandgap fiber

Single-photon-level sub-Doppler pump-probe spectroscopy of rubidium

Stopped and stationary light at the single-photon level inside a hollow-core fiber

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